What do scientists say about the transmission of the swine flu virus？
A. It is easily transmitted from person to person.
B. It remains unclear how it is transmitted.
C. It is transmitted by sneezing or coughing.
D. It is transmitted by skin-to-skin contact.
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A) potential B) performance C) preference D) passion
A) A hardworking ambitious young man. B) A young man good at managing his ti
A hardworking ambitious young man.
B. A young man good at managing his time.
C. A college graduate with practical working experience.
D. A young man with his own idea of what is important.
图中标志表示只准（）行驶。
A. 非机动车
B. 小客车
C. 机动车
D. 出租车
Information black holes can be annoying because .
A. it's not easy to foretell their visits on the net
B. it usually dominates the net page as long as over two hours
C. it steals the users' account number for email box
D. it prevents the users from visiting the websites they like
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